A company is analyzing whether to keep or replace old equipment. The old equipment has a book value of $$54,000$ and a remaining five$-$year life. The new equipment has a five$-$year life, and can be bought for $$104,400.$ The old equipment could be sold now for $$59,000.$ The old equipment incurs variable manufacturing costs of $$13,600$ per year. The new equipment would incur variable manufacturing costs of $$11,200$ per year.

Identify each item as a sunk cost, a relevant cost, or a relevant revenue.